There’s a magic rock in France. It defines our standard of mass, and scientist would like to get rid of it.
Holding Measurements To A Higher Standard
Our measurements of the universe require a standard basis of units. Defining those standards poses certain challenges. After all, how to you measure something that is used to define your measurements?
Light Meter
It is impossible to measure the speed of light, and it has been impossible since 1983. No, the behavior of light didn’t suddenly change in 1983. What changed was the way we define the length of a meter.